<clever>
adamgreig: that might be the video i had seen
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<pie_[bnc]>
oh huh. that would be an "out of the blue" failure mode for me
<pie_[bnc]>
heh.
<pie_[bnc]>
clever: interestingly the guy is saying the LEDs are getting brigter in this as well
<pie_[bnc]>
ah well actually
<pie_[bnc]>
i wonder if that has anything to do with a decrease in resistance heh
<pie_[bnc]>
but it cant be that much relative to the rest of the wire
<pie_[bnc]>
my understanding is overcurrented LEDs fail due to heat? and i suppose the N could be helping with preventing that, but re: im doubtful theres sufficient decrease in resistance
<pie_[bnc]>
oh well hm. he sticks the big one on the multimeter in constant current mode and the voltage goes up...not sure what that means. if the resistance was decreasing id expect a voltage /drop/ to maintain current?
<pie_[bnc]>
oh the big one seems to be composed of a lot of smaller leds though
<sorear>
“resistance” is a meaningless concept for a non-Ohmic device like a forward biased diode
<pie_[bnc]>
sorear: i was thinking of the wire >_<
<pie_[bnc]>
my heuristic is still the naive if its on 0 resistance if its off infinite resitance
<pie_[bnc]>
i dont know how far that is from reality in this region
<pie_[bnc]>
clever: if you google led in liquid nitrogen you get several of these videos
<cr1901_modern>
>i dont know how far that is from reality in this region
<cr1901_modern>
It's a decent model for linear amplifiers, power supplies, and the like
<pie_[bnc]>
clever: https://www.youtube.com/watch?v=5PquJdIK_z8 video description "This experiment works by utilizing liquid nitrogen to cool the semiconductor to -196ºC, robbing it of much of its thermal energy. This causes the "bandgap" energy to increase, thereby increasing the emitted photon energy and decreasing the emission wavelength. "
<cr1901_modern>
pie_[bnc]: It's taught in any undergrad electronics course
<pie_[bnc]>
ah well ok, looks like usual energy level exponential-y stuff
<sorear>
know? not sure what you’re asking
<pie_[bnc]>
ah
<pie_[bnc]>
I was asking to find out how you searched for it, but nevermind then.
<cr1901_modern>
pie_[bnc]: Note that if you try to use that equation, the math gets ugly quickly. E.g. there's no closed-form solution to the voltage/current through a diode in series with a resistor
<pie_[bnc]>
hm ok
<pie_[bnc]>
im not used to solving diffeqs for electronics, so I wouldnt know
<pie_[bnc]>
(well, or diffeqs at all)
<sorear>
I searched wiki for “shockley’s law”
<cr1901_modern>
it's not even a diffeq in the case of a diode and resistor in series; we just don't have good "easy" math to solve for "x" in e^x + x = 1 (which is _I think_ what a diode in series w/ a resistor boils down to)
<pie_[bnc]>
huh
<pie_[bnc]>
guess i havent run into that one yet
<pie_[bnc]>
(presumably for precisely that reason)
<sorear>
well both involve a lot of taylor series
<sorear>
see also lambert “W”
<cr1901_modern>
>The Lambert W relation cannot be expressed in terms of elementary functions
<cr1901_modern>
:(
<pie_[bnc]>
always :(
<pie_[bnc]>
i sure do <3 me some elementary functions
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<sorear>
I mean the “elementary functions” are a kind of arbitrary set
<pie_[bnc]>
are they tho
<cr1901_modern>
sorear: "Can I isolate the independent variable "x" of f(x) using the arsenal of "+", "-", "*", "/", exponentiation, differentiation, and integration?" is how I understand elementary functions.
<sorear>
integration is not allowed
* OK_b00m3r
mutters
<sorear>
erf(x)=integral(exp(-x*x/2), x) is not an elementary function
<pie_[bnc]>
integrals are mad yo
<cr1901_modern>
yea I forgot about that one, although definite integral from -inf/inf is known exactly
<cr1901_modern>
Also, x^5 + x + 1, IIRC has no closed form solution; is that an elementary function?
<pie_[bnc]>
well, can we have nonelementary functions that reduce to exact results, while being irrepresentable as elementary functions?
<ZirconiumX>
"One may exaggerate only a little by saying that if we spit on graphene it becomes a better electrocatalyst."
<ZirconiumX>
Amazing
<ZirconiumX>
"we evaluate in this work if guano-doped graphene poses any advantages over nonguano-doped graphene."
<ZirconiumX>
Did they put bird poo in a SEM? They did, didn't they
<pie_[bnc]>
yes its absolute fucking gold
<pie_[bnc]>
^ at the guano comment
<pie_[bnc]>
i only read the first paragraph
<pie_[bnc]>
i hope the rest of the article is this amazin
<ZirconiumX>
In summary, we demonstrated that bird dropping-treated graphenes indeed make graphene more electrocatalytic than nondoped graphene.
<ZirconiumX>
(plus quotes)
<ZirconiumX>
"We believe that there is potential for the bird dropping-doped graphene for fuel cells and in a hydrogen economy, and we believe that bird droppings can become a high-value-added product such as guano was in the past. One can only hope that with such dramatic advantages, no wars (even trade wars) will be started over bird droppings this time."
<OK_b00m3r>
pie_[bnc] | yes its absolute fucking gold // is that as clever a pun as i think?
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<ZirconiumX>
whitequark would like this article, I think
<pie_[bnc]>
OK_b00m3r: i was thinking of making a poop joke but decided against it
<ZirconiumX>
No shit
<OK_b00m3r>
HAHHHAHA
<whitequark>
i've read it yeah
<pie_[bnc]>
OK_b00m3r: its actually not a pun and i think you might have to explain it, thogh I have a hypothesis
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<OK_b00m3r>
pie_[bnc]: well, samples are frequently coated with gold for electron micrography, so... i liked the pun
<pie_[bnc]>
ah hehe
<OK_b00m3r>
turning shit into gold... for science
<pie_[bnc]>
amazing.
<OK_b00m3r>
pie_[bnc]: my shit is goldplated
<pie_[bnc]>
still more interesting than eating burgers with gold foil in them